A mobile existence overhaul is a necessary constituent of a social network application as it uphold each mobile user's presence information such as the current status, GPS location and network address. Also updates the user's online friends with the information repeatedly. If presence updates happen frequently, the massive number of messages dispersed by presence servers may lead to a scalability issue in a large-scale mobile presence service. The proposal of an efficient and scalable server architecture called presence cloud which facilitates mobile presence services to hold up large-scale social network applications.